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075D0002-01
4.1. MEASUREMENT PRINCIPLES
4.1.1. RBC / WBC / PLT detection principles
The counting principle used for red blood cells (RBC), white blood cells (WBC), and platelets
(PLT) is based on the variation in impedance generated by the passage of cells through a calibrated
microaperture.
1 - The sample is diluted in an electrolytic diluent (current conductor). The conductivity of the
diluent differs considerably from the non conductivity of the blood cells.
2 - The dilution is pulled through the calibrated microaperture. Two electrodes are placed on each
side of the aperture. Electric current passes through the electrodes continuously.
3 - When the cell passes through the aperture, electric resistance (or impedance) between the
two electrodes increases proportionately with the cell volume.
Diag. 4.1
1 Volts
2 Pulse
3 Time
4 Electrodes
5 Analyzing Electronic Circuit
6 I = Constant
7 Vacuum = Constant
8 Solution to be Analyzed
CHAPTER 4. TECHNOLOGY
Содержание ADVIA 60
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Страница 112: ...9 MAINTENANCE AND TROUBLESHOOTING Page 9 20 075D0002 01 9 6 PNEUMATIC DIAGRAM...
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Страница 122: ...APPENDIX A SYSTEM AND REAGENT SYMBOLS Page A 4 075D0002 01...
Страница 126: ...APPENDIX C BIBLIOGRAPHY Page C 2 075D0002 01...
Страница 128: ...INDEX Index 2 075D0002 01...